Warren - Scott, VE7TIL is using 7 strand #2 aluminum wire for his big loop. He has some information on it at the bottom of his 'Station Info' page. He must be out of town presently or I'm sure he would have weighed-in on your inquiry. http://www3.telus.net/sthed/argo/ Steve / 73 WEB - "The VE7SL Radio Notebook": http://members.shaw.ca/ve7sl